Differential Output Amplifier (CB6135E)

This circuit of old American documentation (1965) can be applied to any transistor.

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Optical Telephony Receiver (CB14698E)
We found this circuit in the Texas Instruments optoelectronics manual. Field effect transistors can be...
Exclamation Point Display (CB5178E)
This interesting circuit of an ancient American publication makes the pattern of an exclamation mark...
Digital Timer (CB26205E)
This two-digit timer was found in the 1983 Special Projects issue of Radio Electronics magazine. The...